Adapt workflows for tests

Author: ryyppy

.github/workflows/pull-request.yml

@@ -16,7 +16,9 @@ jobs:
         with:
           node-version: '12.x'
           registry-url: 'https://registry.npmjs.org'
-      - run: npm install
+      - name: Install Test dependencies
+        run: npm install
+        working-directory: ./test
       - name: Test with neovim
         run: |
           nvim --version